The
US Geological Survey bands made for hummingbirds are so tiny that they
are sent on aluminum sheets. The banders are the people who actually
cut the sheets and form the bands. Nancy Newfield uses a tiny sewing
scissors to cut them out, then tweezers and a special shaping tool to
form the bands.

Preparing
bands

200
bands fit on a single small index-card sheet. They are carefully
cut out.

After
cutting out the bands, they are each formed into a leg band using
this shaping tool.